2.0 Analysis 2.1 General The aircraft was maintained in accordance with the manufacturer's specifications and the applicable regulations. The aircraft systems were operated as designed and did not contribute to the overrun or adversely affect the evacuation of the aircraft. Other than the slower than predicted acceleration during the take-off run, and the aircraft not getting airborne as anticipated by the crew, the performance of the aircraft matched the performance predicted by the manufacturer. Although the front-end crew did not call brace and evacuate on the public address system, the evacuation of the aircraft went well. No one used an over-wing emergency exit; therefore, the fact that the flaps were not lowered at the 27-degree position did not affect the evacuation. The flight attendant, with the exception of not shouting the brace command and not activating the emergency lights, reacted to the rejected take-off and subsequent evacuation in accordance with established procedures. She only had a very short time to realize that the aircraft was going off the end of the runway. 2.2 Aircraft De-icing Although it was company procedure to de-ice critical surfaces in these weather conditions, the crew decided not to de-ice the aircraft. Instead, the ground personnel blew the snow off the wings with leaf blowers. While the snow that accumulated on the wings before take-off reportedly blew off during the initial stage of the take-off run, the possibility that some ice or snow contamination remained could not be ruled out. However, this possibility must be considered in the context of the performance data available from the flight data recorder. 2.3 Use of Water Methanol Water methanol was not used for the occurrence take-off. Use of water methanol would have reduced the normal take-off distance by up to 1000 feet. Because the rejected take-off was not initiated as prescribed in operational manuals, the consequences of using water methanol could not be determined with certainty. 2.4 Influences on the Decision to Reject